6. _What is the greatest number that can be heard?_
About forty thousand per second.

7. _What is Voice?_
Sound produced by the vocal chords.

8. _What is an Articulate sound?_
One made by the organs of speech and used in language.

9. _What is a Vocal sound?_
One that is modified but not obstructed by the articulatory organs.

10. _What is a simple Vocal sound?_
One made without any change in the position of the articulatory
organs during its emission.

11. _What is a Coalescent?_
An articulate sound that always precedes and unites with a vocal.

12. _What is a Guttural sound?_
One that is modified by the soft palate.

13. _What are Unarticulate sounds?_
The sounds of the vowels.

14. _How many Elementary sounds do the vowels represent?_
Fifteen.

15. _How many do the Consonants represent?_
Eighteen.